Sensor, apparatus and method for non-invasive measurement of oxygen saturation
First Claim
1. A sensor for noninvasive measurement of oxygen saturation by irradiating human tissue with electromagnetic waves and measuring the intensity of the reflected waves comprising:
- (1.1) carrier means;
(1.2) at least two transmitter means for emitting electromagnetic waves of different wavelengths into the human tissue and mounted on said carrier means; and
(1.3) at least one receiver means disposed on said carrier means for receiving electromagnetic waves of said different wavelengths reflected from the human tissue, said at least two transmitters mounted on said carrier means at distances from said receiver selected such that the lengths of the electromagnetic wave paths through the human tissue at both different wavelengths are substantially equal.
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Accused Products
Abstract
A sensor for non-invasive measurement of oxygen saturation using the reflection method comprises a red transmitter (55), an infrared transmitter (58) and a receiver (57). The distances between the transmitters and the receiver are selected such that the length of the light path (60, 61) between the red transmitter (55) and the receiver (57) is substantially equal to the length of the light path (62, 63) between the infrared transmitter (58) and the receiver (57). The sensor comprises a further red transmitter (56) which is used for another application at the human body or another tissue characteristics where the depth of penetration at the various wavelengths is different from the shown example. Together with an appropriate oximeter, manual or automatic adaptation is possible. Further signal improvement may be obtained by autocorrelating the received signal, detecting its frequency and cross-correlating it with a pattern function of the same frequency.
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Citations
36 Claims
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1. A sensor for noninvasive measurement of oxygen saturation by irradiating human tissue with electromagnetic waves and measuring the intensity of the reflected waves comprising:
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(1.1) carrier means; (1.2) at least two transmitter means for emitting electromagnetic waves of different wavelengths into the human tissue and mounted on said carrier means; and (1.3) at least one receiver means disposed on said carrier means for receiving electromagnetic waves of said different wavelengths reflected from the human tissue, said at least two transmitters mounted on said carrier means at distances from said receiver selected such that the lengths of the electromagnetic wave paths through the human tissue at both different wavelengths are substantially equal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A sensor for noninvasive measurement of oxygen saturation by irradiating human tissue with electromagnetic waves and measuring the intensity of the reflected waves comprising:
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(2.1) carrier means; (2.2) at least one transmitter means emitting electromagnetic waves of different wavelengths into the human tissue and mounted on said carrier means, (2.3) at least two receiver means disposed on said carrier means, each of the receivers being sensitive to at least one of said different wavelengths reflected from the human tissue, said at least two receivers mounted on said carrier means at distances from said transmitter selected such that the lengths of the electromagnetic wave paths through the human tissue, at both different wavelengths, are substantially equal. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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36. A sensor for noninvasive measurement of oxygen saturation by irradiating human tissue with electromagnetic waves and measuring the intensity of the reflected waves comprising:
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carrier means; transmitter means for emitting electromagnetic waves of different wavelengths into said human tissue and mounted on said carrier means; and receiver means disposed on said carrier means for receiving electromagnetic waves of said different wavelengths reflected from said human tissue, said transmitter means and receiver means mounted on said carrier means at distances from each other such that the lengths of the electromagnetic wave paths through the human tissue at both said different wavelengths are substantially equal.
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Specification